Errors for all closed-loop sensors remain within 0.5%, while errors for open-loop sensors range from 2.5% to 7.5%. Again, the closed-loop sensor is 2.5 to 11 times better than open-loop type.

Figure 11 Re-measuring the loop gain T of the circuit of Figure 6a, but via Middlebrook’s method. Bringing it all together. Let us conclude with a detailed analysis of the current amplifier (also ...